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超辐射发光二极管(SLD)光源在变温(-45~70℃)环境下的工作稳定性直接影响光纤陀螺的性能,因此,变温(-45~70℃)情况下其恒流源的驱动稳定性就成为系统设计与优化的关键问题之一。根据恒流模式工作原理,建立了等效电路模型,并得到了表征变温环境恒流源稳定性的数学解析式,根据该式给出了变温环境恒流模式设计的设计依据;利用该解析式还对几种不同情况下恒流源的变温稳定性进行了理论分析与计算;最后给出了验证实验,实验结果与理论计算结果相一致。因此,利用该式可以实现对SLD恒流源性能的有效评估,这对于变温环境下SLD光源驱动设计具有重要指导意义。
The working stability of a superluminescent diode (SLD) light source in a variable temperature environment (-45 ~ 70 ℃) directly affects the performance of the fiber optic gyroscope. Therefore, the driving stability of the constant current source under a variable temperature (-45 ~ 70 ℃) It has become one of the key issues in system design and optimization. According to the working principle of constant current mode, an equivalent circuit model is established, and the mathematical expression characterizing the stability of constant current source in variable temperature environment is obtained. According to the formula, the design basis of constant current mode design in variable temperature environment is given. The temperature stability of the constant current source under different conditions is also theoretically analyzed and calculated. Finally, a verification experiment is given. The experimental results are consistent with the theoretical calculation results. Therefore, an effective evaluation of the performance of the SLD constant current source can be realized by using the formula, which is of great guiding significance for the SLD light source driving design under the temperature changing environment.